Non-determination appeal against an extension of time

Your eight weeks are up, nothing has happened, and the case officer has emailed asking you to sign an extension of time. The choice is between agreeing it and appealing against non-determination, and for most small developers the answer is to agree, once, with a date on it. Appealing feels like taking control and usually costs you months rather than saving them.

Both options are real, though, and there are cases where the appeal is the right call. The difference lies in what you give up.

What each option costs you

Agreeing an extension gives up time and, in most cases, the fee refund under the planning guarantee. In exchange you keep a council that can still grant permission, a case officer who can still negotiate amendments, and the ability to change the scheme without starting again.

Appealing for non-determination gives up the negotiation entirely. The council loses the power to determine the application the moment the appeal is lodged, so nobody can grant you permission except an inspector, on the scheme exactly as submitted, on the papers as they stand. In exchange you get a decision-maker with a published timetable rather than one with a backlog.

For a minor application decided by written representations, the appeal route is frequently slower than waiting another two months for the council. That is the calculation people get wrong.

When the right to appeal arises

The statutory determination periods are eight weeks for minor and householder applications, thirteen weeks for major applications, and sixteen weeks where the development is subject to environmental impact assessment. The clock starts on validation, not on submission, which is a distinction worth checking on your own file.

Once the period expires without a decision, and provided no extension has been agreed, a right of appeal against non-determination arises. It does not expire immediately: you have the same window as an appeal against refusal, so six months in most cases and twelve weeks for a householder application, running from the end of the determination period.

That gives you room to wait and watch. The right of appeal sits there as pressure while the officer finishes the report, and you can lodge it later if nothing moves.

What an extension of time actually is

It is a written agreement between the applicant and the authority that the period for determination is extended to a stated date. It is not a courtesy and it is not open-ended.

Two drafting points matter.

Put a specific date on it, not a period tied to an event. "Until 14 November" is enforceable in the practical sense that you know when to chase. "Until the highway consultation response is received" gives you nothing.

Agree one extension at a time. Councils sometimes ask for a long extension covering every eventuality, and a series of short ones keeps the pressure on while still being cooperative. If a second request arrives with no progress in between, that is information about the file.

The rules around extensions have changed. The fee regulations were amended in 2023 in ways that affect householder applications in particular, including how the guarantee operates and when extensions can be used, so check the current regulations before assuming an extension is available on your case.

Fee refunds and the planning guarantee

The planning guarantee is the mechanism under which an application fee is refunded where the authority has failed to determine the application within a set period. For most applications that period has been 26 weeks.

The point that decides behaviour is this: agreeing an extension of time generally disapplies the guarantee, because the authority is then determining within an agreed period rather than failing to determine. So signing an extension usually trades the refund away.

Whether that matters depends on the fee. On a householder application the sum is small and the relationship is worth more. On a major application it is a different conversation, and it is worth asking the officer directly what the extension buys you in programme terms before signing.

Check the current fee schedule and the current guarantee periods rather than relying on figures quoted anywhere, including here, since both are revised and indexed.

The risk of a decision on an incomplete file

This is the strongest argument against appealing.

At the point of non-determination, the file is often half built. The highway authority may not have responded. The ecology consultation may be outstanding. The officer's assessment does not exist, so the inspector has no reasoned analysis from the authority, only a statement produced afterwards setting out what the council says it would have decided.

Neighbour representations are forwarded as they stand, including ones you would have answered if the officer had put them to you. And you cannot amend the scheme. If the drainage strategy needs revising, that revision belongs in a fresh application, not in an appeal.

The result is that a scheme which would have been approved after two rounds of minor amendments can be dismissed on appeal for a reason nobody had raised. A thorough Planning Statement submitted with the original application is the best insurance against this, because it is the only place your case is set out in full.

Timing the decision

Watch three markers while the period runs. Whether the consultation responses are in, because an application missing the highway authority's comments is not ready for anyone to decide. Whether the officer has raised substantive objections or merely gone quiet, which are different problems. And whether the application has been allocated to a named officer at all, since unallocated files in a stretched team can sit for months without anybody being at fault.

A file with all consultations in and no objections raised is one where the delay really is resourcing, and that is the only version of the problem an appeal reliably solves.

Where the appeal is the right call

Three situations justify it.

Where the council has told you, informally but clearly, that it intends to refuse and is simply not writing the report. You are not losing a negotiation that was never happening.

Where the delay is being caused by something outside the planning process, such as a section 106 negotiation over terms you do not accept. An appeal puts the obligation in front of an inspector.

Where the application is complete, uncontroversial on its technical merits, and the hold-up is purely resources. On a well-evidenced scheme with no objections, an inspector deciding on the papers is a low-risk route.

Outside those, escalate before appealing. Ask for the team leader, ask for a written programme with dates, ask whether the application is going to committee and when the agenda closes. Put it in writing, politely, and copy the head of development management. Most stalled applications move after that email rather than after an appeal.

If you are assembling the evidence base and want to see what a complete submission looks like, browse the report types by category or enter your postcode to check the site.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.